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Business segment (Tables)
 9 Months Ended
Oct. 31, 2015
Business segment reporting [Abstract]  
Business segment reporting [Table Text Block]
 
Three Months Ended October 31,
 
Nine Months Ended October 31,
 
2015

2014

 
2015

2014

Net sales
 
 
 
 
 
Piping Systems

$46,950


$26,540

 

$92,374


$102,683

Filtration Products
19,366

17,279

 
51,677

54,030

Total

$66,316


$43,819

 

$144,051


$156,713

Gross profit
 
 
 
 
 
Piping Systems

$14,315


$4,609

 

$19,796


$25,913

Filtration Products
2,656

2,112

 
6,876

7,342

Total

$16,971


$6,721

 

$26,672


$33,255

Income (loss) from operations
 
 
 
 
 
Piping Systems

$9,721


$1,096

 

$7,470


$12,896

Filtration Products
(162
)
(726
)
 
(1,337
)
(1,300
)
Corporate
(2,199
)
(1,606
)
 
(6,048
)
(5,328
)
Total

$7,360


($1,236
)
 

$85


$6,268